Present participle of bonk; the act of hitting something with a dull sound or experiencing sudden exhaustion during physical exertion.
From the onomatopoetic verb 'bonk,' which mimics the sound produced by impact. The sports sense of running out of energy developed in cycling terminology during the late 20th century.
Cyclists have given English one of its most colorful words for hitting the wall—when your body runs out of fuel and suddenly stops working, you're 'bonking,' and it's as real and painful as it sounds onomatopoetically!
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